Drill puller



Feb. 25, 1947. CRAWFORD v 2,416,288

. DRILL FULLER Filed May 11, 1945 FIG. 1 8

awe/whom ISAAC D. CRAWFORD,

Patented Feb. 25, 1947 UNITED "S TES A T 01F FlCE f Isaac D. Crawford, Creede, Colo.

Application May 11, 1945, Serial No. 593,273

This invention relates to tool pullers, and more particularly to an improved drill puller for extracting mining drills from drill holes.

A main object of the invention is to provide a novel and improved apparatus for withdrawing a jammed drill from a bore hole.

A further object of the invention is to provide an improved drill puller structure characterized by extreme simplicity of parts. and ease of operation.

A still further object of the invention is to provide an improved apparatus for extracting jammed drills from drill holes in mining operations, said apparatus being adapted for rapid setting up and for operation by unskilled labor.

Further objects and advantages of the invention will appear from the following description and claims, and the accompanying drawing, wherein:

Figure 1 is a view taken on line II of Figure 2 showing in plan the appearance of the lower portion of a drill puller according to this invention.

Figure 2 is a side elevational view, partly in section, of the drill puller of Figure 1.

Figure 3 is a front elevational view of the drill puller of Figure 1, a part thereof being shown in section.

In mining drilling operations, the rock drill frequently becomes wedged or jammed in its bore and cannot ordinarily be removed without a great deal of extra labor and additional drilling. It is a prime purpose of this invention to provide a pulling tool adapted to withdraw drill rods and bits which have become lodged in their bore holes.

Referring to the drawing, I designates a, flat base provided with a front leg 2 and a pair of adjustable rear legs 3, 3, said base I being formed with an opening 4 adapted to be placed over the upwardly projecting end of the drill rod. Integrally formed on base I are a pair of parallel vertical walls 5, 5 of generally triangular shape. J ournaled between said walls at their lower portions are a pair of roller elements 6, 6. J ournaled between walls 5, 5, at their upper portions, is a roller element I, said upper roller element being formed with spaced flanges 8, 8. Movably received between upper roller I, be-

tween the side flanges 8, 8 thereof, and the lower roller elements 6, 6, is the hook-shaped end 9 of a 2 Claims. (Cl. 25430) lever member Ill, said lever member being provided with an elongated handle portion II. Pivotally mounted on the forward end portion of hook member 9 is a U-shaped gripping jaw I2. The inner wall surface of jaw I2 adjacent the pivotal connection to hook 9 is inclined upwardly and outwardly, as shown at I3, to form a gripping edge.

In operation, base I is positioned so that the upwardly projecting end of the drill rod passes through opening 4. Lever I0 is then rotated counter-clockwise from the position'shown in Figure 2 so that jaw I2 receives said drill rod within its U-shaped jaw opening. The operator then rotates lever member I0 clockwise, causing jaw member I2 to pivot with respect to hook 9 and to bite into the surface of the drill rod at the gripping edge defined by surface I3. Continued clockwise rotation of lever member ID will exert a powerful upward pull on the drill rod, causing said drill rod to be extracted from its bore hole.

As shown in Figure 3, lever member II] is slightly offset so that the force exerted thereon will be in the same plane as the force exerted on the drill rod when the drill rod is engaged against the curved bottom portion of the U-shaped jaw opening.

The rollers may be lubricated by providing oil spaces within them for feeding oil to their supporting shafts and by providing oilplugs such as shown at I4 for admitting oil into the oil spaces. For example, the rollers may be built up by nesting together short sections of pipe and welding them together at their ends with space provided between them to form an oil reservoir. An oil hole may be provided in the inner section to allow oil to pass from .the oil space to the roller shaft.

While a specific embodiment of a drill puller has been disclosed in the foregoing description, it will be understood that numerous modifications within the spirit of the invention may occur to those skilled in the art. Therefore, it is intended that no limitations be placed on the invention other than as defined by the scope of the appended claims.

What is claimed is:

1. A drill puller comprising a support, a pair of rollers journaled in said support, an upper roller positioned above said pair of rollers, a hook member received between said upper roller and said pair 01' rollers, and a jaw member carried by the forward end of said hook member, said jaw member being adapted to grip a drill shank responsive to rearward rotation of said hook member.

2. A drill puller comprising a base, a pair of 5 vertical parallel walls formed on said base, a pair of horizontal rollers journaled between the lower portions of said walls, an upper horizontal roller journaled between the upper portions of said walls parallel to and above said pair of rollers, a lever 10 member having an arcuately ,curved hook end received between said upper roller and said pair of rollers, and a jaw member pivotally secured to the forward portion of said hook end, said jaw member being adapted to grip a drillshank re sponsive to rearward ,movementof said lever,

member. p

ISAAC D. CRAWFORD.

REFERENCES CITED The following references are of record in the file of this patent;

UNITED STATES PATENTS 

